>> reporter: as negotiations drag on, credit agencies are threatening to downgrade america's perfect credit rating. despite the approaching deadline and doomsday predictions, investors do not seem worried yet that congress will actually let the u.s. default on its loans. terrell, interest rates on u.s. debt remain near historic lows. >> joel brown in washington for us this morning, thank you so much. here's the deal, if a deal isn't reached in time the government will no longer be able to borrow money. that means painful decisions about who gets paid and who doesn't. a recent report from the bipartisan policy center says in august the treasury department has to make $306 billion in payments but it will only take $172 billion. under one scenario, that's enough to pay interest on the debt, social security, medicare and medicaid, also defense contractors and unemployment benefits, but there would be no money left for active duty military personnel, all kinds of federal workers, and a slew of other programs.